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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7cff5ee645b0aeb9724e8886d0754197a294b364034502be24814ee03e7c38' 
  AND token = 'pXQcC0q5fWeZbSj8qgY8p77Pb6SslVPsKP5FghOtpBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}